Description: A classification system for use in describing vegetation has been developed and is being applied to southern California. It is based upon a hierarchical stratification of vegetation, using physiognomic and taxonomic criteria. The system categories are Formation, Subformation. Series, Association, and Phase. Formations, Subformations, and Series have been specified for current southern California plant communities. The system has application to local resource management activities and will serve as a framework for resource assessment reporting as it applies to vegetation.